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with reference to the period of incubation, as well as under the 
conditions of (1) slight shocks, occasioned by moving the eggs 
in the water, as might take place when the redds or nests are 
disturbed by floods, or other causes, and their contents washed 
away to a short distance, but not over great obstacles: and 
(2) direct and somewhat severe shocks, as might be anticipated 
were eggs carried over rapids or steep inclines. 
Eggs quite freshly taken will, it is known, bear travelling, thus 
some were spawned from trout at Howietoun on the morning of 
November 27th, 1884, packed in a cigar box between layers of 
muslin in damp moss, and sent by train to Cheltenham, where 
they arrived the next afternoon, after experiencing rather 
rough usage en route, but they did well. On November 26th, 
1885, some salmon eggs were obtained from the Teith, and 
some trout eggs from the Howietoun fishery, but were not 
packed soon enough to catch me before starting for the train 
early on the 27th. They were despatched the next day, arriv- 
ing at Cheltenham mid-day on the 29th, or about three days 
after having been obtained, but all died, evidently owing to the 
shaking or concussions sustained at this age, when cleavage 
was taking place. I have already remarked on the eggs em- 
ployed in this series of investigations having been sent in a 
swing-can the day they were taken, arriving in about 29 hours, 
consequently the only ill effects they experienced were owing 
to frost. But slight shocks, as might reasonably be expected 
to fish eggs (even when deposited under favourable conditions), 
would be such as occur in artificial fish-culture when it becomes 
necessary to remove them from one box to another, or wash 
them owing to a deposit of mud or dirt which would interfere 
with respiration. 
On January 5th, finding the eggs in tray No. 2, containing 
about 2,500, were covered with a deposit of sediment from the 
water, they were removed to another tray, the temperature of 
the water when the change was made at 9.30 a.m. being 43°, 
and by 8 p.m. 24 were dead. Up to this period of incubation 
or 23 days, there had only been 23 eggs picked out as dead, 
but now the daily pick rose to 31, 2, 7, 7, 2, but subsequently 
